(!!) (2nd Best Pair) 6S4A RCA black plate NOS 1960's - 1971 (20.5ma and 20.0ma)
$ 19.99
1 pair) 6S4A RCA black plate NOS 1960's - 1971 same build
1 tube) 20.5ma Gm=4100 (DG) 1971
1 tube) 20.0ma Gm=4100 1960's faded printing - on left
Matched on Amplitrex
Vplate=250V
Vgrid=-8V
Good Ma range 20-25ma
Good Gm range 4000-4500
(the 6S4A features high plate current at relatively low plate voltages and is capable
of withstanding high pulse voltages)(Vfil=6.3V @ 600ma)
MAX Ratings: Vplate=550V, Iplate=30ma, Pout=8.5 watts
Typical Operation:
Vplate=250V, Vgrid=-8V, Iplate=24ma, Mu=16.5, Gm=4500, Rplate=3700 ohms
- Woo Audio GES Electrostatic headphone amp
See more: vacuum tube
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 (2nd Best Pair) 6S4A RCA black plate NOS 1960's - 1971 (20.5ma and 20.0ma) "Pin It")